Orthogonal Gear Case Segmentation for Design Freedom
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Solution Overview
Problem
Conventional power transmission apparatuses face design constraints due to radially protruding attaching structures, which interfere with other components and limit design freedom.
Innovation Solution
A power transmission apparatus with a case divided into first and second case parts along a division plane extending along the axis of rotation of a gear, eliminating the need for radially protruding attaching structures by fixing the parts together with bolts that do not interfere with adjacent components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If radially protruding attaching structures are used to fix the case body and case end part, then the fixing strength is improved, but the space competition with other components increases and design freedom deteriorates
Solution Approach 1:
The case is divided into a case body and a case end part that can be separately assembled. The attaching structures are integrated into the case end part rather than protruding radially, allowing the case to be segmented for easier assembly while maintaining fixing strength through the bolt connection between the case body and case end part.
Solution Approach 2:
The attaching structures are repositioned from a radial arrangement to a longitudinal arrangement along the axis of the case. This dimensional change allows the attaching structures to be positioned at the end of the case rather than protruding radially, eliminating space competition with peripheral components while maintaining effective fixing.
2Reliability
If radially protruding attaching structures are used, then the case can be securely fixed, but the overall assembly size increases due to space competition
Solution Approach 1:
The attaching structures are repositioned from radial protrusion to longitudinal arrangement at the case end, changing the spatial dimension of attachment. This eliminates the need for additional radial clearance, reducing the overall assembly size while maintaining secure fixing through the bolt connection between case body and case end part.
3Ease of manufacture
If attaching structures protrude radially from the case, then bolt fixation is simplified, but interference with peripheral components such as engine occurs
Solution Approach 1:
The case is segmented into case body and case end part with the attaching structures integrated into the case end part. This segmentation allows the attaching structures to be positioned at the longitudinal end rather than protruding radially, simplifying bolt fixation while eliminating interference with peripheral components like the engine.
Solution Approach 2:
The attaching structures are repositioned from radial direction to longitudinal direction along the case axis. This dimensional change moves the attaching structures away from the radial space where peripheral components are located, eliminating interference while maintaining effective bolt fixation between case body and case end part.
Data Source
AI summary
In order to avoid competition with other components for a space, to thereby improve the degree of designing freedom, the power transmission apparatus includes a transfer case housing and supporting a ring gear and a pinion gear that orthogonally mesh with each other and form an orthogonal gear set, the transfer case is divided into a first case part and a second case part along a division plane that extends along an axis of rotation of the ring gear, and the first and second case parts and are fixed together along the division plane with bolts.